Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments Not Recorded At Fair Value) (Details)

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Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments Not Recorded At Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Carrying Amount [Member]
   
Financial Instrument [Line Items]    
Short-term debt (excluding capital leases) $ 485 $ 485
Long-term debt (excluding capital leases) 1,508 1,505
Estimated Fair Value [Member]
   
Financial Instrument [Line Items]    
Short-term debt (excluding capital leases) 492 490
Long-term debt (excluding capital leases) $ 1,719 $ 1,619